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140 lines
3.8 KiB
140 lines
3.8 KiB
#ifndef ZUTIL_H_ |
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#define ZUTIL_H_ |
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/* zutil.h -- internal interface and configuration of the compression library |
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* Copyright (C) 1995-2024 Jean-loup Gailly, Mark Adler |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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/* WARNING: this file should *not* be used by applications. It is |
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part of the implementation of the compression library and is |
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subject to change. Applications should only use zlib.h. |
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*/ |
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#include "zbuild.h" |
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#ifdef ZLIB_COMPAT |
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# include "zlib.h" |
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#else |
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# include "zlib-ng.h" |
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#endif |
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typedef unsigned char uch; /* Included for compatibility with external code only */ |
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typedef uint16_t ush; /* Included for compatibility with external code only */ |
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typedef unsigned long ulg; |
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extern z_const char * const PREFIX(z_errmsg)[10]; /* indexed by 2-zlib_error */ |
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/* (size given to avoid silly warnings with Visual C++) */ |
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#define ERR_MSG(err) PREFIX(z_errmsg)[(err) < -6 || (err) > 2 ? 9 : 2 - (err)] |
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#define ERR_RETURN(strm, err) return (strm->msg = ERR_MSG(err), (err)) |
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/* To be used only when the state is known to be valid */ |
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/* common constants */ |
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#ifndef DEF_WBITS |
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# define DEF_WBITS MAX_WBITS |
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#endif |
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/* default windowBits for decompression. MAX_WBITS is for compression only */ |
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#define MAX_BITS 15 |
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/* all codes must not exceed MAX_BITS bits */ |
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#define MAX_DIST_EXTRA_BITS 13 |
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/* maximum number of extra distance bits */ |
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#if MAX_MEM_LEVEL >= 8 |
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# define DEF_MEM_LEVEL 8 |
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#else |
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# define DEF_MEM_LEVEL MAX_MEM_LEVEL |
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#endif |
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/* default memLevel */ |
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#define STORED_BLOCK 0 |
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#define STATIC_TREES 1 |
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#define DYN_TREES 2 |
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/* The three kinds of block type */ |
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#define STD_MIN_MATCH 3 |
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#define STD_MAX_MATCH 258 |
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/* The minimum and maximum match lengths mandated by the deflate standard */ |
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#define WANT_MIN_MATCH 4 |
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/* The minimum wanted match length, affects deflate_quick, deflate_fast, deflate_medium and deflate_slow */ |
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#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */ |
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#define ADLER32_INITIAL_VALUE 1 /* initial adler-32 hash value */ |
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#define CRC32_INITIAL_VALUE 0 /* initial crc-32 hash value */ |
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#define ZLIB_WRAPLEN 6 /* zlib format overhead */ |
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#define GZIP_WRAPLEN 18 /* gzip format overhead */ |
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#define DEFLATE_HEADER_BITS 3 |
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#define DEFLATE_EOBS_BITS 15 |
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#define DEFLATE_PAD_BITS 6 |
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#define DEFLATE_BLOCK_OVERHEAD ((DEFLATE_HEADER_BITS + DEFLATE_EOBS_BITS + DEFLATE_PAD_BITS) >> 3) |
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/* deflate block overhead: 3 bits for block start + 15 bits for block end + padding to nearest byte */ |
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#define DEFLATE_QUICK_LIT_MAX_BITS 9 |
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#define DEFLATE_QUICK_OVERHEAD(x) ((x * (DEFLATE_QUICK_LIT_MAX_BITS - 8) + 7) >> 3) |
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/* deflate_quick worst-case overhead: 9 bits per literal, round up to next byte (+7) */ |
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/* target dependencies */ |
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#ifdef AMIGA |
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# define OS_CODE 1 |
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#endif |
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#ifdef __370__ |
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# if __TARGET_LIB__ < 0x20000000 |
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# define OS_CODE 4 |
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# elif __TARGET_LIB__ < 0x40000000 |
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# define OS_CODE 11 |
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# else |
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# define OS_CODE 8 |
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# endif |
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#endif |
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#if defined(ATARI) || defined(atarist) |
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# define OS_CODE 5 |
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#endif |
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#ifdef OS2 |
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# define OS_CODE 6 |
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#endif |
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#if defined(MACOS) |
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# define OS_CODE 7 |
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#endif |
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#ifdef __acorn |
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# define OS_CODE 13 |
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#endif |
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#if defined(_WIN32) && !defined(__CYGWIN__) |
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# define OS_CODE 10 |
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#endif |
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#ifdef __APPLE__ |
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# define OS_CODE 19 |
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#endif |
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/* common defaults */ |
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#ifndef OS_CODE |
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# define OS_CODE 3 /* assume Unix */ |
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#endif |
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/* macros */ |
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#define CHECK_VER_STSIZE(_ver,_stsize) ((_ver) == NULL || (_ver)[0] != PREFIX2(VERSION)[0] || (_stsize) != (int32_t)sizeof(PREFIX3(stream))) |
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/* memory allocation functions */ |
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void Z_INTERNAL *PREFIX(zcalloc)(void *opaque, unsigned items, unsigned size); |
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void Z_INTERNAL PREFIX(zcfree)(void *opaque, void *ptr); |
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typedef void *zng_calloc_func(void *opaque, unsigned items, unsigned size); |
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typedef void zng_cfree_func(void *opaque, void *ptr); |
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#endif /* ZUTIL_H_ */
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